Merge branch 'master' of tuleap.net:tuleap/tuleap/stable into stable

* 'master' of tuleap.net:tuleap/tuleap/stable: (133 commits)
  Tuleap 6.1.99.20
  When migrating a project to gerrit, now Umbrella project inherits parent Umbrella if any.
  Tuleap 6.1.99.19
  It creates group on Gerrit when Group is Created in a Parent Project with no Git repository on Gerrit.
  Fix scheme issue in account maintenance page
  Fix notice error on servic management page
  Tuleap 6.1.99.18
  Use rpm variables
  Fix overflow which prevent dropdowns to display when no content
  Fix border-spacing for top content view
  taking account of code review
  Fix crap introduced in forgeupgrade script
  Now migrating groups while creating parent umbrella projects
  This is Tuleap 6.1.99.17
  Explicit error messages
  Fixing tests and taking account of Modifications
  Dump a forum of a project
  cannot add parent project if we are not admin on both project
  cannot make project its own project
  Recursively create umbrella parent projects on migration
  ...